Dental amalgam or alloy mixer



April 1 1924. .1,489,024 l. A. BURNETT DENTAL AMALGAM OR ALLOY MIXER .Ver

. ful Improvements Patented Apr. 1, 1924.

y IRA. A. BURNETT, OF CHICAGO, ILLINOIS.

DENTAL .AMALGAM OR ALLOY MIXER.

Application filed November 3, 1923. Serial No. 672,685.

To all whom 'it 712mg/ concern.'

Be it known that I, IRA A. BUnNm f, a citizen of the United States, residing at Chicago, inthe county of Cook and `State of Illinois, have invented certain new and usey in Dental Amalgam or Alloy Mixers, of which the following' is a specification.

This invention relates to improvements in agitating or mixing devices, and particularly to that type of such devices winch are intended for use in connection with motordriven dental-engine hand-pieces or other suitable rotatable shafts or spindles, by dentists, for thoroughly and quickly, mixing the ingredients of alloy or amalgam used for dental purposes, and it consists in certain peculiarities of the construction, novel arrangement and combination of the various parts thereof as will be hereinafter more fully set forth and specifically claimed.

The main object of the invention is, to furnish a mixer for the ingredients of amalgam, alloy and the like, which shall be simplend inexpensive in construction, attractive in' appearance, strong, durable, eiiicient and noiseless in operation, with its parts so made and arranged that it can be held in one hand of the operator during its operation, or if desired, can be mounted on a table or other suitable support while ybeing operated, and also, that it can be quickly applied to or removed from the chuck ofthe engine handpiece, or other rotatable member, employed for imparting motion to the parts of the device.

Another and important object, is, the provision of means whereby the container for the ingredients to be mixed will be moved in such a way as to afford a rubbing action to said ingredients, in addition to the agitating or dashing movement thereto, thus effecting the mixture quicker and more thoroughly.

In the drawings,- i

Fig. l is a face view in elevation of a mixer embodying the invention.

Fig. 2 is a vertical sectional view taken on line 2-2 of Fig. l looking in the direction indicated by the arrows, and

Fig. 3 is a plan sectional view taken on line 3-3 of Fig. 2 as indicated by the arrows. n

Like. numerals of reference refer to corresponding parts throughout the different views of the drawing.

t drawing.

yon the bottoniof said channel.

Awhich plate is provided with a ,2l which rests against the rear ends of The bodyk or frame of the device comprises a base portion 5 having a fiat bottom to rest Ona-table or stand if desired, and provided with an upwardly extended hollow and channeled portion G terminating at its upper end in a forwardly extended iange 'T which is horizontally disposed, as shown in Figs. l and 2 of the drawing. The channel S in the rear portion of the upright 6 is rectangular in shape, while the hollow or cavity 9 in the front portion of the part 6 is substantially circular when viewed from the rear, or in other words, the front portion of the upright part 6 is concavo-convex, as will be readily understood by reference to the The body or frame also includes a rear upright member l() which is closely fitted between the side walls of the channel 8 in the upright 6 and-rests at its lower end The member l0 is ofsuiiicient length to extend a considerable distance above the flange 7 of the upright portion 6 andfis provided in its upper portion with an elongated cavity ll over which cavity is placed and secured to the front surface of the member l0 a plate l2 of metal or of any other suitable material, vertically disposed slot i3 in front of said cavity.

The plate l2 by preference is co-eXtensive with the me nber l() and as shown lines the frontsurface of said member and has in its lower portion an opening la in which is located they front end of a sleeve or bushing l5, which latter is extended through a rearwardly and horizontally extended hollow enlargement 16 onthe lower portion of the member 10. y Located in the sleeve l5 for rotation therein is a shaft 17 which has on its front end adis I 18 provided with an eccentricor wrist pin 19 located near its peripher i. The .rear portion of the sha-ft 17 is profvided with a reduced screw-threaded portion 20 around which is mounted a washer the sleeve l5 and the enlargementl and `is held in such position by means of a nut 22 engagingthescrew-threaded portion 20 rearwardly of said washer. Extended rearwardly from the portion 2O of the shaft 17 is a spindle 23 which can be inserted in the hand-piece 2st of a dental engine so as to be enga-ged by the chuclrthereof when it is desired to operate the device. The projection i6, washer 21, and nut 22, are enclosed by a cup-shaped vcap 25 which is secured at its vse Vwardly and downwardly edges to the rear upper part of the base 5 and to the rear surface ot the sides ot the upright portion 6 as well as to the rear portion ot the member 10 by means of screws or otherwise. This cap is provided centrally thereotl with a hollow extension 26 which surrounds the spindle 23 and acts as al guide Jfor the tapered front portion ofthe handpiece 24.- when the latter is being connected to the mixer for operating its parts.

Pivot-ally secured at its lower end to the wrist lpin 19 is a pitman 2T 'which extends upwardly through the channel 8 in front ot the plate 12 to a point near the upper end ot said plate. At a suitable distance below its upper end the pitman 27 is connected to the plate 12 by means of a stud 28 which is extended through the slot 1?) in said plate in such a way as to permit ot its longitudinal movement in said slot. Mounted around the stud 28 between the pitman 2T and plate 12 is a washer 29 which h-olds the pitman in yparallelism with the plate 12, it being understood that the front end orn the stud 28 is provided with a head r enlargement to prevent. displacement of the pitman. Thel rear end of the stud 28 is provided Vwith a head 30 between which and the rear surface ot the plate 12 a washer 31 is placed around the stud. The upper end ot the pitman 2T is provided with a forextended spring 32 the lower end ot which has mounted thereon an inverted cap 33 which has its lower frontportion cut away as at 34, see Fig. 1, for the purpose of facilitating the insertion into said cap and removal therefrom of a container 35 tor the ingredients to be mixed, which container is by pret'- erence in the'form of a capsule of large Ysize such as is commonly used tor administering medicine.

At a. suit-able distance below the stud 2S the pitman 27 is provided with a Jforwardly extended bracket 36 which has on itsupper portion a cup 37 to receive and retain the lower end ot' the container 35 for the ingredients to be mixed. The spring 32 on the upper end of the pitman 2T forms the majo-r part ot a circle and is preferably surrounded by a spiral coiled wire or spring 38 which will not only increase the tension of the spring 82 but will afford a better hold when the lower portion of the spring 32 is' dressed upwardly against its tension in orc er to disengage the cap 33 trom the upper end of the container so that it can be readily removed from the holder therefor, comprising the cap 83 and the bracket held cup 37 on the front` surface of the pitman.

From the foregoing and by referenceto the drawing, it will be seen and readily understood that by fitting a hand-piece 211 of a dental engine on the spindle 23 so that aid spindleV will be engaged by the chuck of said hand-piece, rotary movement may be imparted to the sha-ift 17 and disk 18, thereby causing the pitman to be reciprocated very rapidly, in which movement it is apparent that the ingredients within the container 35 will not only be dashed lr'rom one end oi' the container to its other end, but as the container will be caused to assume d'1- agonally disposed or vertically inclined positions with respect to the guide slot 13 tor the stud 28 ot the pitman in each stroke of the latter, the ingredients will be rubbed against the opposite sides of the container, thereby causing a more thorough and much quicker mixture of the ingredients.

The parts 5, G and 10 constituting the body or frame ot the device may be made ot hard rubber, bakelite, or any other suit-- able material, and when the parts are assembled as shown, it is obvious that the device can be held in one hand ot' the user by placing it so that the part 6 and cap 25 may be grasped by the hand, thus leaving theI other hand tree for holding and manipulating the engine hand-piece.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a mixer of combination with the class described, the a body or supporting frame having a housingnear one or' its ends and a longitudinally extended slot terminating near its other end, of a` shaft transversely journaled in said housing and having at one of its ends a spindle, a disk centrally mounted on the other end of said shaft and having` an eccentric or wrist pin,

a guide extension carried by said trame and surrounding said spindle, a pitman pivotally connected at one of its ends to said pin and extended in parallelism with said slot, means carried by the pitman and engaging said slot for longitudinal movement therein, a holder carried by the pitman comprising a bracket fixed thereon and a spring actuated cap supported by the pitman but spaced from said bracket, and a container interposed between said bracket and cap.

2. In a mixer of the class described, the combination with a body or supporting tra-me having a base portion provided with an upwardly extended'hollow and channeled portion, ot an elongated member fitted in said channel and having in its upper portion a longitudinally extended cavity, a longitudinally slotted plate secured to the surface ot said member having the cavity therein, said member having at its lower portion a lateral extension provided with a transverse opening, a shaft journaled in said opening and having at one of its ends a spindle, a disk on the other end of said shaft provided with a wrist pin` means on said shalt co-operating with said extension for preventing its movement in one direction, a cap surrounding said extension and secured to the body or frame and having a hollow extension surrounding said spindle, a pitman pivoted at one end on said wrist pin and extended in parallelism with the slot of said plate, means carried by the pitman and engaging said slot for longitudinal movement therein, a holder carried by the pitman comprising a bracket fixed thereon and a spring actuated cap supported by the pitman but spaced from said bracket, and a container interposed between said bracket and cap.

3. In a mixer of t-he class described, the combination with a body or supporting frame having a housing near one of its ends and a longitudinally extended slot terminating at its outer end near the other end of said body, of a shaft transversely journaled in said housing and having at one of its ends a spindle, a disk centrally mounted on the other end of said shaft and having an eccentric or wrist pin, a pitman pivotally connected at one of its ends to said pin and extended in parallelism with said slot, means carried bythe pitman and engaging said slot for longitudinal movement therein, a holder carried by the pitman comprising a bracket fixed thereon and a spring-actuated cap supported by the pitman but spaced from said bracket, and a container interposed between said bracket and cap, said pitman carrying means for engagement with said slot being located about midway between the ends of said container.

IRA A. BURNETT. 

